Analysis on the Influences of Shield Tunnel Partition Setting Mode on Structure Mechanical Properties

In order to find out the influence of different setting modes of subdivision partitions and joint forms on pipe corridor structure, finite element method is used to establish pipe corridor structure model and analyze the internal forces of pipe segment structure with simple support and rigid connection of subdivision partitions under the action of stratum load, ground overload and equipment load. The mechanical properties of the steel corbel in the lower beam of the three connection modes and their effects on segment damage are discussed by laboratory tests and numerical calculations. The results show that: Application of a partition plate decreases the bending moment and axial force of the upper half ring and increases the bending moment and axial force of the lower half ring, but the connection mode of the partition plate and side beam has little effect on the mechanical characteristics of the segment structure. The surface cracking of the segment is mainly concentrated on the lower side of the top row of anchor holes. Increasing the number of anchor bolts can effectively control segment cracking and reduce the maximum displacement of the steel corbel. Compared with 6 anchor bolts, the maximum displacement of the steel leg with 9 anchor bolts is reduced by up to 54.2%. In the case of the same number of anchors, increasing the number of anchors can better reduce the concrete damage inside the segment and control the deformation of the steel corbel.